Williamson (shoulder) will make his next rehab start at Triple-A Louisville on Tuesday, MLB.com reports.
Perdomo went 1-for-4 with a walk, a triple and a run scored in Saturday's 2-1 extra-inning loss to the Dodgers.
Arizona manager Torey Lovullo said Saturday that Martinez (elbow) will soon be assigned to Triple-A Reno for additional rehab appearances, MLB.com reports.
Pfaadt allowed two hits and two walks while striking out two over seven scoreless innings in a no-decision versus the Dodgers on Saturday.
Suarez went 1-for-3 with a walk and a two-run home run during the Reds' 8-2 loss to the Nationals on Saturday.
Burns (13-2) took the loss against the Nationals on Saturday, allowing five runs on six hits and three walks while striking out six across 5.1 innings.
Kepler isn't in the lineup for Saturday's game against the Dodgers.
The Reds optioned Petty to Triple-A Louisville on Saturday.
Mey gave up two hits and struck out four over 2.2 scoreless relief innings in Friday's 5-3 loss to the Nationals. He didn't walk a batter.
Rodriguez started in center field and went 1-for-4 with a double in Friday's 5-3 loss to Washington.
